Monday, November 28, 2016

earth - What is the deepest man-made underground tunnel?



http://bm.img.com.ua/img/prikol/images/large/4/0/258204_603914.jpg


What is the deepest tunnel in the Earth's surface?


I have meet numbers, around 300km.


What is the main problem to make tunnel more deeper? What is the problem with 1000km?





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